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- Title
Effects of the aeration mode on nitrogen removal in a compact constructed rapid infiltration system for advanced wastewater treatment.
- Authors
Lu, Xiejuan; Gao, Minggang; Yang, Si; Tang, Dingding; Yang, Fan; Deng, Yangfan; Zhou, Yan; Wu, Xiaohui; Zan, Feixiang
- Abstract
The configuration and the effective operation of constructed rapid infiltration (CRI) systems are of significance for advanced wastewater treatment. In this study, a novel CRI system was developed with a compact structure consisting of two stages, i.e., oxic and anoxic stages. The CRI system was continuously operated for about 140 days under different aeration modes, i.e., tidal flow, continuous aeration, and intermittent aeration. Nitrogen removal was not desirable with tidal flow due to the insufficient oxygen supply in the oxic stage for nitrification, while continuous aeration could achieve good performance for chemical oxygen demand (COD), ammonium, total nitrogen (TN), and total phosphorus (TP) removal. By comparison, the CRI system operated with intermittent aeration was more favorable due to the effective removal ability for pollutants and relatively lower energy demand. The microbial community analysis revealed that Proteobacteria was the dominant phylum in both oxic and anoxic stages of the developed CRI system. Functional microbial groups (Plasticicumulans, Pseudomonas, and Nitrospira in the oxic stage; Thauera, Candidatus_Competibacter, and Dechloromonas in the anoxic stage) were identified for the mediation of carbon, nitrogen, and phosphorus in the system. This study evaluated the feasibility and the optimal aeration mode of the developed CRI system for advanced wastewater treatment, which could satisfy the requirement for the high standard of effluent quality.
- Subjects
WASTEWATER treatment; EFFLUENT quality; CHEMICAL oxygen demand; NITROGEN; ENERGY consumption; NITROGEN removal (Water purification)
- Publication
Environmental Science & Pollution Research, 2022, Vol 29, Issue 49, p74677
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-022-21049-5